Weld-on axle mount coil spring base. Cut from 1/4" steel 6.0" O.D. with a 1/2" retainer bolt hole. Three axle diameter choices. Includes underside gusset with nut keeper opening. Can be used with optional S110 coil spring retainer plates (shown in picture left). Axle mount coil bases are sold as a pair with with gussets, unpainted.